Merge pull request #35 from llh1/uat

Merge from development 1.7.2
Merge branch 'uat'
Bump version numbers; RNA QC
Bundle update
config also can set from an environment variable
Merge pull request #36 from ke4/uat

Config also can set from an environment variable
Use lims-api 2.5.1.pre
Remove sequel persistors
Use lims-core and lims-api version 3
Remove requirements to sequel persistors
Rewrite sample components persistors to use core version 3 persistors
Sample components are now core resource but does not appear in the root json
Rewrite sample persistor to use lims core version 3
Fix specs
Migration to add primary_keys table
Bump version to 2.0.0
Refactoring
Update lims-core
Add unique constraint on primary_keys table for table_name column
Remove unused method for lims-core v3